Self-locking nut and process of making the same.



D. O. WARD,.DEGD.

. H L. WARD, ADKINIBTEATEIX.

SELF LOOKING NUT AND PROCESS OF MAKING THE SAME.

APP-LIQATION IILED JAN. 19, 1912.

1,077,022. PatentedOct. 23; 1913.

portions of the nut.

onrran snares raranr @FFICEQ DANIEL 0. WARD, 0F OAK EABK, ILLINOIS; NELLIE LEE WARD ADMINISTRATRIK 03 SAID DANIEL 0. WARD, DECEASED.

SELF-LOCKING NUT AND EROCESS OF MAKING THE SAME.

Specification of Letters Patent.

Application filed January 19,1912. serial No. 672,197..

in nut locks and more particularly to nut -locks including a self-locking nut having helical thread port-ions extending in parallel relation and located at unequal or different distances from each other, or in such osition and relation to each other as to form valleys or groove portions of different widths and parallel to each other and adapted to admit a screw thread or threads of a bolt to be engaged by the thread or threads of the nut so as to secure or look the same upon the bolt. y l

One of the objects of the present invention is to provide an improved device of this character which is simple, economical to manufacture, and efiicient in construction and operation.

A furtherobject of the present invention is the provision of a device of this character of such a construction as to enable the same to bemade in a practical manner and in commercial quantities with helical screw thread portions extending in parallel relation to each other and located at une ual or different distances from each other or securing or looking the nut or nut locking member upon a. bolt and with other helical or screw threaded portions located at equal or uniform distances from each other and adapted to turn with comparative freedom upon the screw thread or threads of a bolt until the bolt thread comes into engagement with the unequally spaced parallel thread A further object of thepresent invention is the provision of a nut lock comprising :1

main nut and a cap nut, one of said nut members being provided with parallel helical threaded portions unequally spaced and one of said nut members being provided with means rejecting from the base there of outside 0? the threaded aperture therein, whereby when the nut members are brought together upon a bolt, the cap nut will be bowed so as to effectively lock the same upon the bolt.

Other objects. of the present invention will be apparent from the detailed description hereinafter when read in connection with the accompanying drawings forming a part hereof wherein a convenient embodiment of the invention is illustrated and wherein like characters of reference refer to similar parts in the several views.

In the drawings F igure 1 is a side elevation of the improved nut lock, parts be- Patented Get. as, 1913.

ing shown in sect-ion; Fig. 2 is a longitudi-'.

nal section of a slightly modified form of the invention, the invention in this instance comprising a specially formed self-locking nut and a cap nut adapted to cooperate therewith; and Fig. 3 is a longitudinal section of another modified form of the invention, the device in this instance also comprismg a specially formed lock nut and a cap nut adapted tocooperate therewith.

Referring now more particularly to the form of the invention shown in Fig. '1, A designates a threadd bolt of any well known construction upon which is threaded the or: dinary nut B, an improved self-locking cap nut C being threaded upon the bolt above the ordinary nut'B; In the embodiment of the invention illustrated in this figure, the cap nut C is rovided with a threaded opening 0 throug the central portion thereof,

the lowermost threads of which compriseuniformly spaced parallel thread portions 0' and the uppermost threads of which compeculiarly fashioned thread of the cap nut G is conveniently formed by providingthe upper surface'of said cap nut with an up wardly extendin boss 0 which surrounds the thread opening therein and I a helical thread is first formed in the thread opening, all of the thread portions of which are uniformly spaced. The boss 0 is then compressed longitudinally of the. thread opening in the nut or parallel to the axial center of the nut, thus bringing the helical thread portions which extend through the boss closer together than the uniformly spaced thread portions of the main body of the nut which will not be disturbed by such compressing operation, the boss or projection 0 being of less area or smaller in cross section than the main body portion of the the ordinary nut and into engagement there with, and is locked in its adjusted position by reason of the engagement of the threads of the bolt with the closely spaced locking threads in the upper portion of the cap nut. As the cap nut is screwed home onto the main nut, the ribs 0 which project from the underside of the cap nut will be caused to bite into the surface of the main nut and -.thus lock the cap nut in fixed relation to the main nut. Furthermore, as the cap nut is screwed home and the transverse ribs 0 thereof are caused to engage the main nut, the body of the cap nut will be-slightly bowed so that the threads thereof will be caused to more firmly engage the threads of the bolt.

In Fig. 2 of the drawing the device comprises a main nut D which provided with a threaded aperture extending therethrough. the upper portions of the thread of said aperture comprising thread portions 03 which are positioned closer to each other than the remainder of the thread, and a cap nut D which is ada ted to be used in con'unction with said main nut, said main nut eing so fashioned that as the cap nut is screwed downwardly thereon, it will be bowed slightly thus causing the threads thereof to be moved into locking engagement with the threads of the bolt. 7

In the form of the invention disclosed in Fig. 2 the nut D is formed by providing a channel d in the upper surface thereof intermediate the outer edge thereof and the thread opening thereof, threading the thread opening in the usual manner, and then compressing longitudinally the portion of the nut which is inclosed by the groove (P so as to form the lockin threads d. The portion of the nut which is thus compressed is positioned below the plane of the portion of the nut whichis positioned outside of the groove d so that there is, in effect. formed an upwardly extendin flange d around the outer portion of the olt, and as the cap nut D is screwed home it will be seen that it will, by reason of its engagement with the flange d, be slightly bowed and thereby locked upon the bolt.

The construction shown in Fig. 3 is somewhat similar to that shown in Fig. 2, a nut F being utilized which is provided with a threaded bolt opening centrally thereof, the threading of which comprises uniformly spaced thread portions 1 in the main body portion of the nut and thread portions f in the upper portion of the nut which are spaced closer together than the thread por- I tions f. In the embodiment of the invention illustrated in the figure, the nut F is formed by providing a blank with the usual threaded opening and compressing the upper portion of the blank immediately surrounding the thread openin therein, to form the locking threads f. ompressing the blank in this manner forms a recess f in the upper surface of the nut around the thread opening therein which results in forming. an upwardlyprojecting peripheral portion f A- cap nut F of the ordinary construction is adapted to be used in conjunction with the nut F. When the cap nut F is screwed home into the main nut F it will, by reason of its engagement with the peripheral portion f be slightly bent or bowed, and thus locked in its adjusted position on'the bolt.

l/Vhile a convenient embodiment of the invention is illustrated in the accompanying drawings, it will be understood that many adapted to engage a nut and hold the same in fixed relation to the self-locking nut.

2. A self-locking nut comprising in its construction a body havin a bolt-receivin aperture, and provided wit a helical thread portion encircling the aperture and consisting of uniformly spaced convolutions, and another helical thread ortion located closer to'said first mentioned helical thread portion than the uniformly spacedconvolutions are to each other, for holding said self-locking nut in fixed relation to a bolt, and transverse ridges provided with sharp edges on op osite sides of the threaded perforation an projecting from the face of the body, adapted to engage a nut and holdthe same in fixed relation to the self-locking nut.

3. A self-locking nut comprising in its construction a body having a bolt receiving aperture, a boss projecting beyond an adjacent surface of the body and encircling the aperture, and a helical thread encircling the aperture, said thread comprising convolutions in the body and other convolutions in the boss and located at difierent distances from each other than are the convolutions in the body for holding said self-locking nut in fixed relation to a bolt,'and transverse rid es provided with sharp edges on oppo site sides of the threaded perforation and projecting from the face of the body, adapted to engage a nut and hold the same in fixed relation to the self-locking nut.

4. In a device of-the class described, the combination of a self-locking nut member comprising in its construction a body having a bolt receiving aperture, a boss projecting beyond an adpcent surface of the body and encirclin' the aperture, and a helical thread encircling the aperture, said thread comprising convolutions in the main body and other convolutions in the boss located closer together than theconvolutions in the body for holding said self-locking nut member in fixed relation to a bolt, transverse ridges rovided with sharp ed es on opposite si es of the threaded per oration and projecting from one face of the body, adapted to engage a nut and hold the. same in fixed relation to the self-locking nut member, a threaded bolt in threaded engagement with said self-locking nut member, and a threaded nut in engagement with the projecting edges of the self-locking nut member and in threaded engagement with the bolt.

5. In a device of the character described, the combination of a self-lockin member comprising in its construction a dy having a bolt receiving aperture and provided ment with theedges &

with helical thread portions unequally spaced and adapted to engage the helical thread of a bolt, transverseribs upon said body provided with shar edges rejecting endwise of the body and adapted to engage a nut for holding the same in fixed relation to the nut lock member, a threaded bolt in threaded engagement with said self-locking nut lock member, and a threaded nut in engageof the nut lock membar and ed engagement with the belt. I

6. In a deviceof the character described, the combination with a nut, and a self-lockin cap nut,. said nut and ca nut being provi ed with alined threaded bolt receiving apertures extending therethrough, the aperture, of one of said members being provlded with helical threaded port-ions unequally spaced and adapted toengage the helical thread ofa bolt, one of said nut members bein provided with means projectin from the face thereof outside of the threafed aperture therein, whereby when the nut members are brought cap nut will be bowed.

.DANIEL O. WARD.

in threa Witnesses:

HENRY IRWIN CROMER, JENNIE L. FISKE.

together upon abolt, the 

